By John Worley, S.E. and Pierre Quenneville, Ph.D
“Residual drift” is the permanent lateral deformation of a building following an earthquake (Figure 1). In high seismic regions, buildings designed per code utilizing ductile seismic force resisting systems defined in ASCE 7 could experience excessive residual drifts in a major earthquake that may result in a damage level deemed to be uneconomical to retrofit and therefore be demolished.
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